/*
 * Copyright 2025 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.psi

import org.cangnova.cangjie.lexer.CjTokens
import org.cangnova.cangjie.psi.stubs.CangJieTypeProjectionStub
import org.cangnova.cangjie.psi.stubs.elements.CjStubElementTypes
import com.intellij.lang.ASTNode
import com.intellij.psi.PsiElement

class CjTypeProjection : CjModifierListOwnerStub<CangJieTypeProjectionStub> {
    constructor(node: ASTNode) : super(node)

    constructor(stub: CangJieTypeProjectionStub) : super(stub, CjStubElementTypes.TYPE_PROJECTION)

    val projectionKind: CjProjectionKind
        get() {
            val stub = stub
            if (stub != null) {
                return stub.getProjectionKind()
            }

            val projectionToken = projectionToken
            val token =
                projectionToken?.node?.elementType
            for (projectionKind in CjProjectionKind.entries) {
                if (projectionKind.token === token) {
                    return projectionKind
                }
            }
            throw IllegalStateException(projectionToken!!.text)
        }

    override fun <R, D> accept(visitor: CjVisitor<R, D>, data: D?): R? {
        return visitor.visitTypeProjection(this, data)
    }

    val typeReference: CjTypeReference?
        get() = getStubOrPsiChild(CjStubElementTypes.TYPE_REFERENCE)

    val projectionToken: PsiElement?
        get() {
            val star = findChildByType<PsiElement>(CjTokens.MUL)
            if (star != null) {
                return star
            }

            val modifierList = modifierList
            if (modifierList != null) {
                val element = modifierList.getModifier(CjTokens.IN_KEYWORD)
                return element
            }

            return null
        }
}
